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I've wondered too, but after reading some threads I came to conclusion that the best way to get to mid-high elo (where I believe I belong) is start a new account, master some champions and use them in duo queue with your friend and start your new ranked from winning.

How to increase ELO practically: Pick a champion and master it, you will gain elo eventually.
How to increase ELO theoretically: In order to gain elo, you must have higher than 50% win rate at the present. This means that if you win 100 games in a row and after that your win-loss rating goes to 50-50%, you cannot gain elo. This is also true in the other side of the spectrum; if you were 1800, lost 20 games, then go to win 50-50, you cannot get back to 1800.